"Password Checkup" Extension
By Catalin Cimpanu
for Zero Day
It works every time you log into an online service. The extension takes the username and password entered in the login form and checks each one against a database of over four billion credentials that Google engineers have collected from public breaches in the past few years.
If the username and password combo are found in Google's internal database of unsafe credentials, the extension will show a popup alerting you that you need to change the credentials.
According to Google, they designed the extension with privacy in mind, so both Google and attackers can't abuse it to reveal or learn the user's passwords.
The Password Checkup extension can be downloaded from the official Chrome Web Store, here.
